Kazecore

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* ``np-utils`` cli tool (see ``cli.py``, `PR 40 <https://github.com/KAZEBLOCKCHAIN/kaze-python-core/pull/40>`_)
* alter initialization of Crypto signature curve

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* Fix formatting of ``ToKazeJsonString()`` which was cutting off trailing zeroes from integers.

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* Fix travis deploy to be compatible with recent kaze-python changes
* Update scrypt and logzero dependency versions

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* Enabled Python >= 3.4 in setup.py

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* Bugfix: Dont unhex when writing var bytes (`PR 36 <https://github.com/KAZEBLOCKCHAIN/kaze-python-core/pull/36>`_)

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* Added ``ParseString`` method to UInt160/UInt256 (`PR 35 <https://github.com/KAZEBLOCKCHAIN/kaze-python-core/pull/35>`_)